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Global system for mobile communication (GSM) frequency deviation estimation method and system

A technology of frequency offset estimation and frequency offset, which is applied to baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as inability to overcome GSM signal Doppler frequency offset, no frequency offset correction, etc., to achieve Improve signal quality, prevent disconnection, and high calculation accuracy

Inactive Publication Date: 2012-09-19
COMBA TELECOM SYST CHINA LTD
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AI Technical Summary

Problems solved by technology

However, because ordinary repeaters do not have the function of frequency offset correction, they cannot overcome the Doppler frequency offset phenomenon of GSM signals generated in high-speed mobile environments.

Method used

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  • Global system for mobile communication (GSM) frequency deviation estimation method and system
  • Global system for mobile communication (GSM) frequency deviation estimation method and system
  • Global system for mobile communication (GSM) frequency deviation estimation method and system

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Experimental program
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Embodiment Construction

[0019] see figure 1 , a schematic flow chart of the GSM frequency offset estimation method of the present invention. The GSM frequency offset estimation method of the present invention comprises the following steps:

[0020] S101 searches for all GSM carrier frequencies;

[0021] Preferably, the method for searching the GSM carrier frequency is to calculate the average power of each carrier frequency, and search each carrier frequency according to the size of the average power. The carrier frequency where the FCCH channel is located is constant power transmission without power control.

[0022] S102 locks the carrier frequency containing the FCCH channel and extracts the FCCH channel signal;

[0023] Preferably, according to the GSM carrier frequency searched in step S101, the carrier frequency with the largest average power is locked. The FCCH channel signal is searched in the carrier frequency with the largest average power, and if the search for the FCCH channel signal ...

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Abstract

The invention discloses a global system for mobile communication (GSM) frequency deviation estimation method which comprises the following steps that: all GSM carrier frequency is searched; the carrier frequency which contains a frequency correction channel (FCCH) is locked and an FCCH signal is extracted; and frequency deviation is estimated according to the extracted FCCH signal. According to the method, the real-time performance is strong, the computing precision is high, the hardware is easy to realize, the frequency deviation value of a GSM signal can be accurately estimated, particularly the Doppler frequency deviation value of the GSM signal under a high-speed environment can be estimated in real time. The invention also discloses a GSM frequency deviation estimation system which comprises a carrier frequency searching module, an FCCH signal extraction module and a frequency deviation estimation module. According to the invention, the signal quality in a carriage can be improved on a vehicle-mounted repeater, so that the cutting off rate can be effectively improved, and the GSM signal is not off line and cannot be normally called, switched and the like.

Description

technical field [0001] The invention relates to the field of GSM frequency offset estimation, in particular to the field of Doppler frequency offset estimation of GSM signals in a high-speed environment. Background technique [0002] With the development of national economy, high-speed vehicles are widely used in our daily life. There is an increasing demand for people to use communication tools in a high-speed mobile environment, so the requirements for network quality in a high-speed environment are also getting higher and higher. After the sixth national railway speed increase in 2007, the GSM (Global System of Mobile Communication, Global System for Mobile Communication) network in some areas experienced a sharp increase in call drop rates and a serious decline in voice quality in railway coverage areas. In addition, high-speed railways have been popularized throughout the country. As a new and important special scene, the test on the high-speed railway that has been o...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L25/02
Inventor 张航
Owner COMBA TELECOM SYST CHINA LTD
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